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→Displaying the Form
'''how:''' is a binary mask, and following bits can be set in it:
<blockquote>
IO_CLEAR (0x2u)<br />IO_SHOW_ALL (0x4u)<br />IO_SHOW_ERROR (0x8u)<br />IO_SHOW_HELP (0x16u)<br />
</blockquote>
The display function work in following order:
